It was more that they initially had no plans of releasing the classes of 2 genders..
They still don't, I'm saying this now so it wont come as a suprise
What they are doing is to create two different classes, but similar
One Male-type Archer and one Female-type Archer for example.
They look similar, follow the same theme, but will differ somewhat in play style (Probably, as they will be different classes).
You see what I mean?
Now, I believe they think it is unfitting to create a hulk-like female in the game... from what I've seen, they try to beutify their world, much similair to what the Final Fantasy series attempt to do